Contents

In the 1950s, the world's scientists attempted to prolong the race's life; however, their experiments killed the entire adult population. The growth and development of the planet's children (who, in the aftermath of this tragedy, began to call themselves "Onlies") was slowed to the rate of one month per century, but the older survivors would age rapidly and die upon reaching puberty.

The homeworld of Miri and her friends, the Onlies, appeared at first to be a simple copy of Earth; however, it was later discovered that Miri's homeworld was actually Earth itself, of an alternate timeline. Miri's Earth had briefly drifted into the main universe, due to instability in the local sector of space. In June2274, the planet returned to its original timeline. (DTInovel: Forgotten History)

Various sources have given different names and planetary numbers for the planet.
The novelization of the episode by James Blish states that the planet is the fourth planet of the 70 Ophiucus system. This story also ignores the stated idea that the planet is a parallel Earth, and states that it was an old Earthcolony which was established in the early 2100s and forgotten about. The TOSnovelThe Cry of the Onlies gives the planetary designation of Juram V and supports the parallel Earth theory. The reference bookStar Charts gives the planet the designation of Miri and gives a designation of FGC-347601 III, making it the third planet of the system. In the older Star Trek Maps it was the third planet in the UFC 347601 system. The novel Preserver calls it Site 2713 and describes it as one of three Earth duplicates created by the Presevers. Forgotten History provides a different explanation: Miri's homeworld is actually Earth of a parallel timeline.